Two-time premier Bhutto was killed in a bombing and shooting incident in Rawalpindi and the then government claimed to have intercepted telephonic conversation which showed that the Tehreek-i-Taliban Pakistan (TTP) was responsible for her death.
Ex-telephone operator of the Inter-Services Intelligence (ISI) excused himself from testifying before the court yesterday, saying his life is in danger as he lives in Karak district in Khyber-Pakhtunkhwa, which is close to the restive tribal areas, the Dawn reported today.
Five suspects - Aitzaz Shah, Rafaqat Hussain, Husnain Gul, Sher Zaman and Abdul Rashid - are facing trial in the case.
Former president Pervez Musharraf, former city police officer Rawalpindi Saud Aziz and former SP Khurram Shahzad were also accused in the case.
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Besides the refusal of former operator of ISI, another witness, US journalist Mark Seigel, could not testify before the court.
However, the prosecution had informed the court that Seigel could record his statement through video link.
It is believed that Seigal had some vital information as Bhutto had sent him an email before his death about danger to her life.